Many grasses are adapted for grazing. One such adaptation is the positioning of their meristems, which are high above the ground away from hungry herbivores
A. true
B. false
B
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The brain center for homeostatic control of the internal environment is the ________
a. hypothalamus b. cerebellum c. pons d. thalamus
Spines increase a cell's surface area, so the spiniest diatoms should be the most buoyant. Which selective force below might explain the observed shift in spine number?
a. More predators were present during the ice age, favoring diatoms with more spines b. Endothermic animals in colder climates tend to have smaller surface area to volume ratios to conserve heat c. Diatoms with more spines could swim better allowing them to stay afloat in colder water d. As Yellowstone Lake warmed up the water density decreased, favoring less buoyant diatoms e. During the ice age Yellowstone Lake would have received more light from reflection off of the snow, allowing diatoms to live at greater depths
Scientific research companies sell kits that allow researchers to produce proteins in test tubes via a process known as "in vitro translation." Which one of following components is NOT needed in these kits?
A) amino acids B) transfer RNA C) DNA D) ribosomes
Sheaths of the bacterium Sphaerotilus are tubelike structures that are in intimate contact with the chain of cells that they enclose.
Answer the following statement true (T) or false (F)